From f27795fcfe1b645d93a80d0dd8d948f76360b1ea Mon Sep 17 00:00:00 2001
From: Bauke <me@bauke.xyz>
Date: Wed, 21 Sep 2022 16:18:53 +0200
Subject: [PATCH] Add OPML output option.

---
 Cargo.lock     | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml     |  1 +
 source/main.rs | 15 ++++++++-
 3 files changed, 103 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 0a1b1ec..8a13570 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -215,6 +215,30 @@ version = "0.26.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "22030e2c5a68ec659fde1e949a745124b48e6fa8b045b7ed5bd1fe4ccc5c4e5d"
 
+[[package]]
+name = "hard-xml"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3477ce594ff6d821c38fc3f8d28744b9bac0340c94b152ebb0f8a1fd5b740f54"
+dependencies = [
+ "hard-xml-derive",
+ "jetscii",
+ "lazy_static",
+ "memchr",
+ "xmlparser",
+]
+
+[[package]]
+name = "hard-xml-derive"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3aa4585e2b133d2479ff3f03febd76972234cc04b40cdb374fab11a7f7b797ca"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.12.3"
@@ -273,6 +297,12 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "jetscii"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47f142fe24a9c9944451e8349de0a56af5f3e7226dc46f3ed4d4ecc0b85af75e"
+
 [[package]]
 name = "js-sys"
 version = "0.3.60"
@@ -339,6 +369,17 @@ version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e82dad04139b71a90c080c8463fe0dc7902db5192d939bd0950f074d014339e1"
 
+[[package]]
+name = "opml"
+version = "1.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d41b8c4211bfa2e51d1910dbad2b4740e06486ece44de3fd9c7512f009ff9e99"
+dependencies = [
+ "hard-xml",
+ "serde",
+ "thiserror",
+]
+
 [[package]]
 name = "os_str_bytes"
 version = "6.3.0"
@@ -448,6 +489,26 @@ dependencies = [
  "untrusted",
 ]
 
+[[package]]
+name = "serde"
+version = "1.0.144"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f747710de3dcd43b88c9168773254e809d8ddbdf9653b84e2554ab219f17860"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.144"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94ed3a816fb1d101812f83e789f888322c34e291f894f19590dc310963e87a00"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "sharded-slab"
 version = "0.1.4"
@@ -470,6 +531,7 @@ dependencies = [
  "clap",
  "color-eyre",
  "indicatif",
+ "opml",
  "ureq",
 ]
 
@@ -515,6 +577,26 @@ version = "0.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "949517c0cf1bf4ee812e2e07e08ab448e3ae0d23472aee8a06c985f0c8815b16"
 
+[[package]]
+name = "thiserror"
+version = "1.0.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c53f98874615aea268107765aa1ed8f6116782501d18e53d08b471733bea6c85"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8b463991b4eab2d801e724172285ec4195c650e8ec79b149e6c2a8e6dd3f783"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "thread_local"
 version = "1.1.4"
@@ -767,3 +849,9 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "xmlparser"
+version = "0.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "114ba2b24d2167ef6d67d7d04c8cc86522b87f490025f39f0303b7db5bf5e3d8"
diff --git a/Cargo.toml b/Cargo.toml
index 3f2517f..4d547a5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,6 +14,7 @@ path = "source/main.rs"
 [dependencies]
 color-eyre = "0.6.2"
 indicatif = "0.17.1"
+opml = "1.1.4"
 ureq = "2.5.0"
 
 [dependencies.clap]
diff --git a/source/main.rs b/source/main.rs
index 627f3cd..1555aa1 100644
--- a/source/main.rs
+++ b/source/main.rs
@@ -23,6 +23,10 @@ pub struct Args {
   #[clap(short, long)]
   pub appid: Vec<usize>,
 
+  /// Output the feeds as OPML.
+  #[clap(long)]
+  pub opml: bool,
+
   /// The time in milliseconds to sleep between HTTP requests.
   #[clap(short, long, default_value = "250")]
   pub timeout: u64,
@@ -66,8 +70,17 @@ fn main() -> Result<()> {
     feeds_to_output = potential_feeds;
   }
 
+  let mut opml_document = opml::OPML::default();
   for feed in feeds_to_output {
-    println!("{feed}");
+    if args.opml {
+      opml_document.add_feed(&feed, &feed);
+    } else {
+      println!("{feed}");
+    }
+  }
+
+  if args.opml {
+    println!("{}", opml_document.to_string()?);
   }
 
   Ok(())